Quiksilver Kids Mix Up Tee Shirt for Boys (2T-7) If you find yourself repeat reaching for the same tee shirt over and over it's time to mix it up. Our cool Mix Up T-Shirt amps up your day to day with fresh graphics, our regular fit, and casual short sleeves. That wasn't so complicated... 22 Singles ringspun jersey. Solids: 100% cotton. Heathered: 50% cotton, 50% polyester. Machine wash. Imported.